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Articles by M. Jafari
Total Records ( 4 ) for M. Jafari
  K. Mahdavi , A. Sanadgol , H. Azarnivand , S. Babaei Kafaki , M. Jafari , M. Maleki and A. Malekian
  The objective of this research was to investigate the effects of removing aerial biomass and density of Atriplex lentiformis plantation on carbon sequestration and biomass in a split-split plot design with three replications in Ardestan, Iran. The results revealed that the highest amount of carbon sequestration produced by treatment of 2x2 m row spacing, annual removing and control height removal. The values of carbon storage of aerial biomass, among row spacing and removal of aerial biomass treatments were significantly different (p < 0.05). The highest carbon storage content was related also to 2x2 m row spacing and control with 60 cm height removing. None of the treatments was significantly different, concerning soil carbon storage (p < 0.05). Moreover, the highest biomass weight was in row spacing of 2x2 m while the lowest value was recorded in 6x6 m.
  M. Jafari and P. Alavi
  The influence of jet-to-jet spacing, freezing air velocity and nozzle to food distance on freezing time of slab shaped food is investigated numerically using CFD (computational fluid dynamics). The jet width is 3 cm and the food length and thickness are 120 and 4 cm, respectively. An optimum jet-to-jet spacing is obtained. Continuity, momentum and energy equations were solved using Fluent 6.0 a commercial Computational Fluid Dynamics (CFD) solver. In order to model the turbulent air flow, the standard k-ω turbulence model was applied. The interaction between two jets is found to be most advantageous and the freezing air velocity, nozzle to food spacing is other important factors affecting freezing time.
  M. Jafari and P. Alavi
  In this study, numerical simulation using Computational Fluid Dynamics (CFD) was conducted to predict the effect of various parameters on freezing time of slab shaped food by a slot air impingement. Continuity, momentum and energy equations were solved using Fluent 6.0 a commercial Computational Fluid Dynamics (CFD) solver. In order to model the turbulent air flow, the standard Reynolds Stress Model (RSM) was applied. The results of this study show that the freezing air temperature and velocity, nozzle to food spacing are important factors affecting freezing time of slab shaped foods. This study provides useful information for optimum design and operation of food freezers.
  M. Jafari , M.S. Kamarudin , C.R. Saad , A. Arshad , S. Oryan and M.H.T. Guilani
  The main objective of this study was to investigate the effect of different diets on Caspian kutum larval growth, survival and body composition, thus the Caspian kutum was examined in diets, Starved (S), Egg yolk (E), Artemia nauplii (A) and Artemia nauplii plus egg yolk (A+E). Totally four dietary treatments were tested in triplicate for 30 days. A significant growth difference between fry fed was observed in Artemia plus egg yolk (p<0.05). Final mean lengths and weights for each treatment (S, A, E, A+E), respectively were 7.0±0.07, 26±0.91, 23.5±0.91, 28.6±0.18 mm (Mean±SE, n = 12) and 4.9±0.08, 57±2.14, 51±2.18, 74±3.64 mg (Mean±SE, n = 12). The larvae accumulated increasing protein in Treatment A+E and lipid in treatment E (p<0.05). Also, the highest survival rate, 70.9±2.1%was in the treatment A+E and was significantly higher compared to 59.5±1.45% and 56.6±0.98%and in the other group (p<0.05). During culture period some other factors such as DGC (Daily Growth Coefficient), DWG (Daily Weight Gain), DLG (Daily Length Gain) and SGR (Specific Growth factor Rate) were measured. The obtained result showed that diet Artemia plus egg yolk is promising for use in Caspian kutum culture for in early stages of life cycle.
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